The centre upon which the observed paths converge is called the radiant point or, shortly, the radiant.
Three under Hiller, Bellegarde and Hohenzollern were to converge upon Aspern, the other two, under Rosenberg, to attack Essling.
This latter carries a hyperboloidal mirror, which returns the rays towards the centre of the large mirror and causes them to converge less rapidly.
Rumma converge in lower Kasim, and at Aneza Doughty says its bed is 3 m.
Other bridges are the Obermainbriicke of five iron arches, opened in 1878; an iron foot (suspension) bridge, the Untermainbriicke; the Wilhelmsbriicke, a fine structure, which from 1849 to 1890 served as a railway bridge and was then opened as a road bridge; and two new iron bridges at Gutleuthof and Niederrad (below the city), which carry the railway traffic from the south to the north bank of the Main, where all lines converge in a central station of the Prussian state railways.